and the next president of the united states, barack obama. >> reporter: in a surprise appearance, president obama joined clinton on stage. the president speaks tonight. vice president biden did a late-night walk through while break down continues at bank of america stadium and his speech and all today's events moved inside amid the threat of severe weather dampening the democrats' final day. tracie potts, nbc news, charlotte, north carolina. >>> and president obama may not be the only speaker who will electroify the crowd tonight. roll call is reporting that gabrielle giffords will deliver the pledge of allegiance. the spokesperson is confirming that gifford is in charlotte for the dnc. she resigned from congress, you remember, back in january a year after she was wounded in a shooting spree in arizona. >>> the possible first lady will stop by a horseback riding economy. romney is an avid rider who started competing as part of her therapy for ms. virginia is considered one of the key battleground states that will help decide november's big election. >>> as for her husband, the secret servic